This information seems to be very useful. I have a 1994 S320 and I want to change the drive belt soon. I have looked at the tensor, but I do not see any bolts at all. It would of great help for me if you could please provide with some kind of drawing. Another thing is, how do you access the tensioner from the back?. Do you access it from under the car?. If you could please provide me with this information I would be very grateful. Thank you.